how to use the merge function from the rxjs library in typescript

To use the merge function from the rxjs library in TypeScript, first, you need to install the rxjs library:

index.ts
npm install rxjs
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Then, you can import the merge function using the ES6 import statement in your TypeScript code:

index.ts
import { merge, Obsersvable } from 'rxjs';

// define two observable streams
const stream1$: Observable<number> = of(1, 2, 3);
const stream2$: Observable<string> = of('a', 'b', 'c');

// merge the two observables streams into one
const merged$: Observable<number | string> = merge(stream1$, stream2$);

// subscribe to the merged stream
const subscription = merged$.subscribe(
  (value: number | string) => {
    console.log(value);
  },
  (error: any) => {
    console.error(error);
  },
  () => {
    console.log('complete');
  }
);

// unsubscribe from the merged stream
subscription.unsubscribe();
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In the code above, we first import the merge function and the Observable type from the rxjs library.

Then, we define two observable streams stream1$ and stream2$ each producing some values.

Next, we merge the two observable streams using the merge function which takes an array of observable streams to merge.

We then subscribe to the merged observable stream merged$ and log the emitted values.

Finally, we unsubscribe from the merged observable stream to clean up resources.